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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35baa5d39079542f8297a52e24ebc3a95ec0daecf34d7c52601644bac480c09c' 
  AND token = 'G6y0ulRSA+mUHhQY4wj02pUBdz6seIEcrknHTlG7JeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}